I loved Florence. We stayed in the center of town right on the piazza across from the Ufizzi Gallery. I did not see one homeless person the whole time I was there. The city was clean too.
Even in Rome where we stayed right around the corner from the Spanish Steps. In general I found the center of the city to be pretty clean. I can remember one homeless person lying on a sidewalk talking to herself on the way back from dinner. One homeless person in the four days we were there.
Pretty nice for a city of 3 million.
Take an empty hi-rise and put a soup kitchen on the top floor. Make them take the stairs up to get there. It would be good for their health/cardio. Panoramic views.
Then they can go down to the next floor and enjoy a glass or 2 of boxed wine as a reward.
The bottom floors can be used for shelters. Laundromat on a separate floor and showers on another.